Midnight Guests

Settle a four-guest vampire party in the northwest suite and a four-guest ghost party in the southeast suite before forty bells. Select a party and tap a neighboring room to walk or merge with an identical party. The moon doors alternate: horizontal doors open on silver bells, vertical doors on blue bells. Every move or Ring bell flips the doors and spends one bell. Different species or sizes cannot merge. Parties of four become settled and immovable only in their matching suite. The two dark corners are closed rooms. Ring a bell when the route needs the same direction twice, but do not waste the night. Keyboard: Tab and Enter/Space operate buttons; R restarts.